The use of ozone and associated oxidation processes in drinking water treatment

Some issues limiting photo(cata)lysis application in water pollutant control: A critical review from chemistry perspectives.

Degradation kinetics of 2,4-D in water employing hydrogen peroxide and UV radiation

Water in a process water system, such as a cooling tower or pulp and paper processing plant, is treated to destroy biological microorganisms by diverting the portion of the water flowing through the system to a side stream. In the side stream, chemicals are added such as halide ions or sodium chlorite. The water is then passed through an electrolysis unit or a UV radiation unit to oxidize the precursor to form an active oxidant. Advantageously, the pH of the side stream can be lowered to significantly improve the oxidization of the halide ions. When a very small portion of the flow rate is passing through the side stream, the acid added does not significantly alter the pH of the entire system. In a preferred embodiment, the acid added is phosphonic acid which acts as an antiscalant. Also included in the present invention is a method to inject oxidant precursors into a process water system through an oxidant generation station.

Method and apparatus for controlling microorganisms

Effects of pH and H 2 O 2 on ammonia, nitrite, and nitrate transformations during UV 254nm irradiation: Implications to nitrogen removal and analysis

A process is described for detoxification of drinking water and waste water by means of UV light and hydrogen peroxide and, if required, chemical activators in the continuous flow process, using one or more low pressure UV lamp(s) (11) in combination with suitable sealing material (12) between lamp(s) and the water to be treated, which material does not block UV radiation with a wavelength of in particular 254 nm and below, the water to be treated being conducted past the UV lamp(s) (12) in a sufficiently thin layer (18) and H2O2 being added at a suitable point (16) to the water stream to be treated.

Process and device for water detoxification

Oxidative decomposition of organic water pollutants with UV-activated hydrogen peroxide Determination of anionic products by ion chromatography

Die Erfindung betrifft ein Verfahren zur Entgiftung von Trinkwasser und Abwasser mittels UV-Licht und Wasserstoffperoxid und gegebenenfalls chemischen Aktivatoren im Durchflusverfahren, wobei man eine oder mehrere Niederdruck-UV-Lampe(n) (11) in Kombination mit geeignetem Abdichtungsmaterial (12) zwischen Lampe(n) und zu behandelndem Wasser verwendet, das die Abstrahlung von UV-Licht mit einer Wellenlange von insbesonders 254 nm und darunter nicht behindert und das zu behandelnde Wasser in hinreichend dunner Schicht (18) an der oder den UV-Lampe(n) (12) vorbeifuhrt und dem zu behandelnden Wasserstrom an geeigneter Stelle (16) H 2 0 2 zusetzt.

Verfahren und Vorrichtung zur Wasserentgiftung

Verfahren und vorrichtung zur wasserentgiftung Method and device for water decontamination

Method and apparatus for water decontamination

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